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Charlotte, North Carolina (CNN)One person was shot Wednesday during a second night of protests over a deadly police shooting in Charlotte, city officials said.

The person, who was not identified, is in critical condition and on life support, the city tweeted. Earlier, the city had tweeted that the person had died. The person was shot by another civilian, the city said.

One police officer was injured, according to a city tweet. The officer was transported to a hospital with undisclosed injuries.

The riot and protests came on a day in which the city's police chief gave more details on the shooting that took the life of Keith Lamont Scott.

Chief Kerr Putney addressed the Scott family's claim that he was reading a book in his vehicle when police officers approached and shot him.

Putney said Scott, an African-American, was armed and no book was found at the scene. He was shot by an African-American officer after refusing repeated demands to put down a gun, which was recovered from the scene, Putney said.

Wednesday night, scores of protesters gathered in two locations in Charlotte.

Mayor Jennifer Roberts, who spoke by phone with CNN's Don Lemon, called on demonstrators to heed calls from Scott's family and the NAACP to remain peaceful.

"Go home and tell everyone violence is not the answer. The investigation is ongoing, it will be transparent," she said.

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The chief said he was not certain whether Scott pointed his gun at officers. Vinson, who was in plain clothes and wearing a CMPD vest, did not have a body camera. Three uniformed officers were wearing cameras, there is also dash cam recordings, and investigators are reviewing the footage, Putney said.

The mayor said she will be watching video from the incident on Thursday.

A person doesn't have to point a weapon directly at police to prompt deadly force, CNN law enforcement analyst Art Roderick said.

"You don't have to actually wait until a handgun is pointed at you because you're talking milliseconds of a decision as to whether you're going to pull your trigger, or that individual is going to pull their trigger," Roderick said.

Who is the officer?

Officer Brentley Vinson

Vinson has worked for Charlotte-Mecklenburg police for two years.

He played football at Liberty University from 2009-2012 and majored in criminal justice, according to his biography on Liberty University's website.

Former teammate Austin Marsh told CNN that Vinson was a "standup guy."

"It breaks my heart to see something like this happen, and I have a really hard time believing that Brent shot a man in his car while waiting for his (son) for no reason," Marsh said.

"Brent has always been a great guy founded on good morals. I find it very hard to believe that he would gun down an innocent man."

CNN briefly spoke to Vinson's father, Alex Vinson, on the phone. He asked for privacy and said no one in the family would be speaking to the media.

The officer has been placed on paid administrative leave, Mayor Jennifer Roberts said.

On Wednesday, Keith Scott's wife released a statement saying her family is devastated and she called for protesters to remain calm.

"Keith was a loving husband, father, brother and friend who will be deeply missed every day," Rakeyia Scott said. "As a family, we respect the rights of those who wish to protest, but we ask that people protest peacefully. Please do not hurt people or members of law enforcement, damage property or take things that do not belong to you in the name of protesting."

Protesters stand outside Bank of America Stadium in Charlotte, North Carolina, during the NFL football game between the Carolina Panthers and the Minnesota Vikings on Sunday, September 25. Violent protests erupted on Tuesday after the death of Keith Lamont Scott, who was shot by a police officer in an apartment complex parking lot. Charlotte-Mecklenburg Police Chief Kerr Putney said Scott exited his car with a gun and that he was shot after he wouldn't drop it. Scott's family said he was unarmed and sitting in his car reading a book.

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Charlotte-Mecklenburg police officers arrive outside of Bank of America Stadium prior to the Panthers game on September 25.

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Demonstrators take a knee outside Bank of America Stadium as the national anthem is played on September 25.

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Members of the National Guard stand watch in front of a Charlotte hotel on Friday, September 23.

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Protesters march in Charlotte on September 23.

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A protester, right, expresses his opinion to a police officer and another pedestrian near Trade and Tryon Streets in Charlotte on Thursday, September 22.

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Residents and activists march in the streets of Charlotte on September 22. There was a heavy police presence, and the National Guard was also on hand.

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Protesters confront police officers near Trade and Tryon streets on September 22.

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National Guardsmen stand at their post in downtown Charlotte on September 22.

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Members of the North Carolina National Guard speak with residents and visitors on September 22.

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Police officers and protesters carry a man who was shot during the second night of protests on Wednesday, September 21. The shooting victim, 26-year-old Justin Carr, later died. Police have charged another civilian in connection with Carr's death.

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A protester shouts to a crowd in downtown Charlotte on the evening of September 21.

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A police officer in riot gear stands near a damaged storefront on September 21.

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Protesters throw chairs at a restaurant on September 21.

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A protester stares down law enforcement officers during protests on September 21.

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A police officer tries to grab a protester from the crowd.

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Charlotte public defender Toussaint Romain pushes a protester back from a line of police. "We can't lose any more lives, man. I'm a public defender. I can't represent any more people," he told CNN's Boris Sanchez.

On the first night of demonstrations, police officers face off with protesters on Interstate 85.

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After blocking traffic on I-85, some of the protesters took cargo from tractor-trailers and set it on fire.

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Protesters react to a police helicopter.

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A police officer stands guard near a fire on I-85.

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Protesters run from a gas canister after blocking traffic on I-85.

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Protesters march down W.T. Harris Boulevard.

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Police officers face off with protesters on the first night of demonstrations.

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A police officer faces protesters.

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Charlotte Mayor Jennifer Roberts has called for a full investigation into the shooting. She said the officer who shot Scott, Brentley Vinson, has been placed on paid administrative leave. Vinson is also black.